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Mitigating decoherence in hot electron interferometry

Lookup NU author(s): Dr Lewis Clark, Dr Clive Emary

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

© 2020 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft. Due to their high energy, hot electrons in quantum Hall edge (QHE) states can be considered as single particles that have the potential to be used for quantum optics-like experiments. Unlike photons, however, electrons typically undergo scattering processes in transport, which results in a loss of coherence and limits their ability to show quantum-coherent behaviour. Here we study theoretically the decoherence mechanisms of hot electrons in a Mach-Zehnder interferometer (MZI), and highlight the role played by both acoustic and optical phonon emission. We discuss optimal choices of experimental parameters and show that high visibilities of ⪆ 85% are achievable in hot-electron devices over relatively long distances of 10 μm. We also discuss energy filtration techniques to remove decoherent electrons and show that this can increase visibilities to over 95%. This represents an improvement over Fermi-level electron quantum optics, and suggests hot-electron charge pumps as a platform for realising quantum-coherent nanoelectronic devices.

Publication metadata

Author(s): Clark LA, Kataoka M, Emary C

Publication type: Article

Publication status: Published

Journal: New Journal of Physics

Year: 2020

Volume: 22

Issue: 10

Online publication date: 14/10/2020

Acceptance date: 18/09/2020

Date deposited: 09/11/2020

ISSN (electronic): 1367-2630

Publisher: IOP Publishing Ltd

URL: https://doi.org/10.1088/1367-2630/abb9e5

DOI: 10.1088/1367-2630/abb9e5

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